The headphone jack will work because the player converts the audio for you then pumps into the system. The USB will likely not work since it reads the file directly from the device and tries to convert it to audio. (USB) SYNC will recognize and play MP3, WMA, AAC and WAV files. http://www.syncmyride.com/own/modules/faqmanagement/FaqList.aspx?tagId=37#question47